Automatic article feeding system

• US 5,503,516 A
• Filed: 07/18/1994
• Issued: 04/02/1996
• Est. Priority Date: 08/07/1987
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamamoto, Toshihiro, Kasai, Shozo, Yasuhara, Masateru, Nikaido, Norio, Inaba, Ryohei, Azuma, Yusaku, Tanita, Takeo, Arai, Mitsuo
• Primary Examiner(s): Bucci, David A.
• Assistant Examiner(s): KRIZEK, JANICE LEE
• Application Number:
  US08/276,755
• Time in Patent Office: 624 Days
• Field of Search: 221/134, 221/228, 221/233, 414/277, 414/281, 414/331, 414/411, 414/786, 414/929, 901/6, 901/7
• US Class Current: 414/800
• CPC Class Codes: B23P 19/001 Article feeders for assembling machines screws or nuts being carried by a disposable strip or disc B25B23/045
• CPC Class Codes: B23Q 7/10 by means of magazines
• CPC Class Codes: B23Q 7/1494 using grippers
• CPC Class Codes: B65G 65/00 Loading or unloading of vehicles B65G67/00

Abstract

A method for feeding articles to a robot comprises the steps of temporarily storing a plurality of containers in a temporary storing device including a rest on which the plurality of containers are stacked and a separator for simultaneously separating the stacked containers from each other, stocking a plurality of containers supplied from the temporary storing device in a stocker, and feeding the stocked containers to the robot one-by-one.

Claims

1. A method for feeding articles to a robot from a stocker retaining plural kinds of containers, each container containing a predetermined kind of articles, said method comprising the steps of:

temporarily storing a stack of containers each retaining a predetermined kind of articles in a temporary storer including a vertically moveable table on which the containers are stacked and a separator for separating one container from the others;

memorizing information of a stacking position of each container stacked on the moveable table;

sending an article request command for requested articles to the stocker in accordance with a pre-programmed feeding order to select a container stocked in the stocker containing the requested articles;

feeding articles from the selected container in the stocker to the robot while detecting any containers in the stocker which are about to be emptied;

sending, when a container is detected to be emptied, a container separation request to the temporary storer to separate a full container containing the same kind of articles that are about to be emptied from the container from other containers in the temporary storer using the separator on the basis of memorized information of the stocking position of the containers on the moveable table; and

replacing only the container detected to be emptied in the stocker with the full container from the temporary storer while articles are being supplied from another container in the stocker to the robot.

2. A method for feeding articles to a robot as set forth in claim 1, further comprising the step of disposing the containers in a stacked relationship on the table so that they can be supplied to the stocker one-by-one from a bottom-most container in the stack.

3. A method for feeding articles to a robot as set forth in claim 1, further comprising the step of engaging an empty container in the stocker and removing it therefrom.

4. A method for feeding articles to a robot as set forth in claim 3, further comprising the steps of:

supporting the containers independently in the stocker on a frame having a plurality of shelves; and

vertically moving the frame from a position in which an uppermost shelf opposes the separator and a position in which the lowermost shelf opposes the separator.

5. A method for feeding articles to a robot, comprising the steps of:

temporarily storing a stack of containers, each retaining a predetermined kind of article, in a temporary storer including a vertically moveable table on which the containers are stacked, and a separator for separating one container from the others;

memorizing information of a stacking position of each of the containers stacked on the moveable table;

feeding articles from a selected one of a plurality of containers stocked in a stocker to the robot;

separating a designated container full of articles from other containers in the temporary storer when a container in the stocker is emptied by vertically moving the table and making the separator engage the designated container, as articles are being fed to the robot from other containers in the stocker, wherein said separating step takes place based on memorized information of the stacking position of the designated container;

removing the designated container from the temporary storer;

replacing the empty container in the stocker with the designated container;

restoring the remaining containers in the temporary storer into a stacked condition by disengaging the separator and moving the table; and

updating the information of the stacking positions of the remaining containers on the table in response to the removal of the designated container.

6. A method for feeding articles to a robot as set forth in claim 5, further comprising the steps of:

discharging the empty container from the stocker.